Ishiharalevyillä

Ishiharalevyillä is a term that can refer to a set of visual tests used to detect color vision deficiencies, most commonly red-green color blindness. These tests are named after Dr. Shinobu Ishihara, a Japanese ophthalmologist who developed them in 1917. The tests consist of a series of colored plates, each containing a pattern of dots. Within the dots, certain numbers or shapes are subtly embedded, formed by colors that are difficult for individuals with color vision deficiencies to distinguish from the surrounding dots. For example, a person with normal color vision might easily see the number 74 embedded in a field of green dots, while someone with a specific type of red-green color blindness might see a different number or no number at all.

The Ishihara test is widely used as a screening tool in various settings, including ophthalmology clinics, schools, and for occupational assessments where accurate color perception is important, such as for pilots or electricians. The test is relatively simple and quick to administer. Variations of the test exist to assess different types of color vision deficiencies and their severity. While the Ishihara test is highly effective for screening, a more comprehensive examination by an eye care professional may be necessary for a definitive diagnosis and to understand the specific nature of the color vision deficiency. The term "levyillä" in Finnish translates to "on plates" or "with plates," directly referencing the format of these diagnostic tools.